EuPATORiTJM. COMPOSITiE. 81 



16. EUPATORIUM. Tourn. i7ist. t. 259 ; Linn.; Gtertn. fr. t. 166; 

 DC.prodr. 5. p. 141. 



Heads 3-1 00-flowered. Involucre cylindrical or campanulate ; the scales 

 imbricated in 2-3 or niore series, or sometimes nearly equal in a single se- 

 ries. Receptacle flat, naked. Corolla tubular-infundibuliform or often with 

 a campanulate limb, 5-toothed, frequently dilated at the base. Anthers in- 

 cluded. Branches of the style mostly exserted and elongated, cylindra- 

 ceous or somewhat flattened, obtuse. Achenia 5-angled, without intermediate 

 strice. Pappus a single series of very slender capillary bristles, scabrous or 

 minutely serrulate. — Perennial herbs or somewhat shrubby plants (the great- 

 er portion American), with opposite (sometimes alternate or verticillate) sim- 

 ple or rarely divided leaves. Heads mostly corymbose. Flowers purple, 

 blue, or white. Leaves, involucre, corolla, and achenia often sprinkled with 

 resinous globules ; the former rarely impressed-punctate. 



§ 1. Heads cylindrical, 5-60-Jlowered : scales of the involucre numerous, 

 closely imbricated in several series, oppressed, obtuse, strongly striate ; the 

 outer ones shortest : leaves opposite or rarely alternate. 



1. E. ivcejhliwn (Linn.): herbaceous; stem terete, somewhat hispid; 

 leaves opposite, narrowly lanceolate, tapering to each end, scarcely petioled, 

 3-nerved, subserrate, glabrous; corymb trichotomous, loose ; heads oblong, 

 pedicellate, 15-20-flowered ; scales of the involucre few, erect, striate, olj- 

 tuse. DC. — Linn, amcen. acad. 5. p. 405, c^ spec. {ed. 2.) 2. p. 1174 ; 

 Sivartz, obs. p. 301 ; DC. prodr. 5. p. 146. 



/?. Ludovicianum : leaves less attenuated at each end, often rather obtuse; 

 the uppermost short and nearly sessile ; corymbs more dense. — E. neurolepis, 

 Torr. ! herb. E. calocephalum, Nutt. .' in trans. Amer. j)]nl. soc. {n. ser.) 

 7. p. 286. Liatris oppositifolia, Nutt. ! in Sill. jour. 5. 2^- 299. 



Open woods or fields, Louisiana, near New Orleans, Tainturier ! Nut- 

 tall ! Dr. Ingalls! Dr. Riddell! Jackson, Dr. Carpenter! and Alexandria, 

 Western Louisiana, Dr. Hale ! July-Nov. — Stem branched, 3-5 feet high. 

 Lower leaves about 2 inches long, broadly lanceolate, rather sparingly ser- 

 rate ; those of the numerous branchlefs very short. Corymbs with 6-20 

 heads, more contracted than in the West Indian plant. Scales of the invo- 

 lucre about 20 ; the inner ones somewhat dilated and colored (purplish) at 

 the summit. Flowers light purplish-blue. — We have only seen West In- 

 dian specimens of E. ivjefolium ji. DC. ; which has more pointed leaves 

 than our plant, but appears scarcely to difler in other respects. This is 

 our only representative of a large and marked group of tropical American 

 species. 



§ 2. Heads cylindrical, 5-lO-Jlowered : scales of the involucre numerous, co- 

 lored, obtuse, slightly striate, imbricated in several series; the outermost 

 much shortest {style bulbous at the base): herbaceous: leaves large, mostly 

 verticillate : Jloicers purplish. 



2. E. purpurcum (Linn.) : stem stout, simple, fistular or nearly solid, 

 pubescent or glabrous; leaves (3-G-nately) verticillate or rarely opposite, 

 oblong-ovate or lanceolate, more or less petioled, acuminate, veiny, scabrous or 

 glabrous above, somewhat ])ubcscent beneath and minutely dotted with resin- 



VOL. II.-ll 



